Leonard colbman



L. COLEMAN.

Grinding Mill.

Patented .l une l12. 1860.

NA PETERS Phowiulmgmpner. wnslnngun. n. C4

'r i' 55 l UNITED STATES PATENT OFFICE.

LEONARD COLEMAN, OF NEIV ORLEANS, LOUISIANA.

MILL.

Specification of Letters Patent No. 28,655, dated June 12, 1860.

To all whom t may concern:

Be it known that I, LEONARD COLEMAN, of the city of New Orleans, parish of Orleans, and State of Louisiana, have invented certain new and useful Improvements in Mills; and I do hereby declare that the same are described and represented in the following specication and drawings.

To enable others skilled in the art to make and use my improvements I will proceed to describe their construction and operation, referring to the drawings, in which the same letters indicate like parts in each of the iigures.

Figure l, is a perspective view of the improved mill. F ig. 2, is a section representing Fig. l, cut perpendicularly through the center. Fig. 3, is a section of the bush step and spindle. Fig. 4, is a plan or top view. Fig. 5, is a plan of the step with the hand wheel for raising and lowering the stop. Fig. 6, is a plan of the dress of the stones.

The nature of my invention and improvements in mills, consists in making the metal frame or husk and the hoop of the mill all in one piece, by casting it whole or altogether. Also in supporting the hopper by a feed pipe, with a screw on the outside working in a female screw in the top of the case, so as to adjust the pipe and graduate the feed as desired.

In the accompanying drawings A, is the frame or husk of the mill, B the hoop around the lower stone, which hoop and frame are made in one piece by casting them both together and in the form shown in the drawings, or in such other form as will answer the purpose, with bars or arms C, C, extending in from the bottom of the frame to the circular center D, which is perforated and provided with a female screw on the inside as shown in Fig. 3, to which the male screw on the box E, is fitted. The upper part of the box E is made conical on the inside, and the lower part straight with a female screw in it to which the male screw F, is tted; which screw has four arms G, G, projecting upward from its upper end with parallel screws H, H, between the arms as shown by dotted lines in Fig. 5, for the traversing composition boxes I-I, I-I, which the step turns between, which boxes are hollowed out to fit the step, and made rounding on the outside and narrow at the upper end to fit the inside of the conical box E, so that as the shaft or step and boxes wear the screw F, may be turned, so as to force them upward in the conical part of .the`box, and bring them tight to the shaft, and at the same time keep the shaft in its true or proper center. And some pieces of steel may be placed under the end of t-he step or lower end of the shaft at I.

As the turning of the screw F, to tighten the boxes might raise the stone with the shaft I have therefore made the screw E, to turn in the frame and applied the hand wheel J, to it so that the miller can adjust th stone at pleasure, by turning the hand wheel, and screwing the box E, up or down. The plate K, under the stones is perforated in the center, and has the flange K around the opening, which has a female screw in it for the box E, which is similar to the box E, just described and has a screw F, with arms and traversing boxes like those around the step, and the screw F is similar to the screw F, except it has a hole entirely through it for the shaft or spindle L, which shaft is provided with a pulley L to turn the spindle L, and under stone M, which is hung on the top of the spindle by the rind N, which has a square cavity in it to receive the square end of the spindle L.

O, is the spout through which the meal or flour escapes from the mill. The hoop B, on the plate K, surrounds the lower sto-ne which is turned by the spindle; and the upper edge of the hoop has a female screw on the inside to which the screw on the lower edge of the top Q, is fitted.

The top Q, is made in the form shown in the drawing, and the upper and stationary stone is cemented or fastened in it in some convenient manner. There is a female screw in the center of the top Q, to which the screw on the feed pipe R, is fitted, so as to adjust the end of the feed pipe nearer to or farther from the top of the rind to graduate the supply of grain fed to the stones when grinding. The hopper S, which supplies the grain to the feed pipe R is fastened to the pipe.

Fig. 6, shows the dress of the stones the rotating stone turning in the direction of the arrow. In this dress the deep side of the main furrows T, are made tangential to one side of the eye as shown in the drawing for about live eighths of the distance from the eye to the periphery, when the direction of the furrows are changed so that the deep side of the remaining three eighths next to the periphery of the stone is tangential to the opposite side of the eye as shown in the drawing for the purpose of retarding the meal in its progress from the eye to the edge of the stone while it is being ground. The deep side of the short furrows extends to the deep side of the main furrows, and the short furrows are made with an angle as shown in the drawing nearly like the angle in the main furrows.

This mill has many advantages over all others within my knowledge. The boxes may be tightened around the spindle and step without throwing the stone out of tram, and as the boxes are turned in tightening, the several pieces composing the box are brought successively to the wearing side, so that they are worn uniformly. The eye of the stone is made small, which eiects a saving of power, by breaking the grain near the center. The grain never hangs in the eye of the stone, so as to let the mill run empty and injure the dress.

This mill is made of far fewer pieces than mills have been made before; therefore it is less liable to get out of order, and is better adapted to the use on plantations than any mill ever made before, and better suited to persons of limited skill in milling than any other.

I believe I have described and represented my improvementsl in mills, so as to enable any person skilled in the art to make and use them. Y

I will now state what I desire to secure by Letters Patent, to wit:

l. The metal frame A, and hoop B, of the mill in one piece constructed as described.

2. In combination with the parts above claimed, the feed pipe R, supporting the hopper and adjusted by a screw substantially as described.

L. COLEMAN. Witnesses:

I. DENNIss, J r., EDW. F. BROWN. 

